Creating badRequestResponse helper method inside errors.go and use in in the createMovieHandler.

cmd/api/movies.go

@@ -19,8 +19,9 @@ func (app *application) createMovieHandler(w http.ResponseWriter, r *http.Reques
 
 	// Use the new readJSON() helper to decode the request body into the input struct. If this returns an error, we send the client the error message along with a 400 Bad Request status code, just like before.
 	err := app.readJSON(w, r, &input)
+
 	if err != nil {
-		app.errorResponse(w, r, http.StatusBadRequest, err.Error())
+		app.badRequestResponse(w, r, err)
 		return
 	}